When asked if there was anything non-consensual about their sexual activity, he replied: “Not at all, he was keen, he was enthusiastic.”

Brizzi said he personally didn't like auto-erotic asphyxiation personally.

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OBSESSED: Stefano Brizzi enjoys watching Breaking Bad

He added: “People like to gag when they perform oral sex - I wasn't particularly into this thing.

“Gordon bowed in front of me, he was performing oral sex on me, he asked me to gag him, that's when the whole breath control thing started.

“I was trying to please his desires and unfortunately that's how the whole thing has gone wrong.”

Brizzi broke down in tears as he described tying PC Semple to the bed by his wrists and ankles using cuffs and black cords.

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“He started to ask for things I have never done before – things I have always deemed as dangerous like leaving him without breath and trying to strangle him”

Stefano Brizzi

He said: "There was no violence, there was no abuse as such, it was all acting.

"We are creating a scene, creating a scenario when you are in your fantasies.

"As the game progressed it became increasingly unfamiliar to me, he started to ask for things I have never done before – things I have always deemed as dangerous like leaving him without breath and trying to strangle him."

He told the court PC Semple asked him to sit on his face and use his buttocks to suffocate him.

They had agreed a safe word of "red" but Brizzi claims he never said it.

Some of the officer's remains were found dissolving in a bath of acid, other body parts were found in Brizzi's bin, and in the communal bins of the Peabody Estate, the court heard.